compoundchem: Added a newer, poster friendly version of the Metal Ion Flame Test Colours graphic to the store today! You can view the original post here, which includes an explanation of the origin of the colours.
When atoms of elements are heated to high temperatures, some electrons may absorb enough energy to allow them to move to higher energy levels. This excited atom is unstable, and the electrons quickly return back to their positions of lower energy or their
Flame test colours The flame test is used to visually determine the identity of an unknown metal or metalloid ion based on the characteristic color the salt turns the flame of a bunsen burner. The heat of the flame converts the metal ions into atoms which become excited and emit visible light. The characteristic emission spectra can be used to differentiate between some elements. Argon Bright Purple, Xenon Light Purple